There's now an autosplitter available in LiveSplit for this game. Since all runs are framecounted from the video, the LiveSplit time won't be accurate for leaderboards, it will be +-1 frames in most cases.
In order to activate it, go to Edit Splits, make sure the game name is set to either New Super Mario Bros. Versus (or + Category Extensions), and press Activate.
You can see the current features from the Settings-button. If there are any split conditions you'd like to get added, feel free to contact me on Discord.
Recently New Super Mario Bros. Versus were updated to the version 2.0 and the 1.7 is no longer playable, it means the world record and runs will remain FOREVER! (unless you have played before the 2.0 version). From now on, every run submitted, will have to wait a long time until the leaderboard setu